21303434252 has 6 divisors (see below), whose sum is σ = 37281009948. Its totient is φ = 10651717124.

The previous prime is 21303434227. The next prime is 21303434261. The reversal of 21303434252 is 25243430312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2662929278 + ... + 2662929285.

It is an arithmetic number, because the mean of its divisors is an integer number (6213501658).

Almost surely, 2^21303434252 is an apocalyptic number.

It is an amenable number.

21303434252 is a deficient number, since it is larger than the sum of its proper divisors (15977575696).

21303434252 is a wasteful number, since it uses less digits than its factorization.

21303434252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5325858567 (or 5325858565 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 29.

Adding to 21303434252 its reverse (25243430312), we get a palindrome (46546864564).

The spelling of 21303434252 in words is "twenty-one billion, three hundred three million, four hundred thirty-four thousand, two hundred fifty-two".